Sweetwilliam
Dianthus barbatus
Last reviewed: June 2026
Sweetwilliam is toxic to dogs and cats.
Listed as toxic by the ASPCA Animal Poison Control Center (last reviewed 2026-05-21). If your pet has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435and your veterinarian's emergency line.
Pollinator Patch flags toxic plants so you can choose a pet-safe native alternative for your yard.
Light
full sun
Water
medium
Size
12"–24" H × 12"–18" W
Bloom
May, Jun, Jul
Native to
NC
Pollinators
bees, butterflies, moths
Sweet William produces clusters of fragrant, colorful flowers in shades of pink, red, white, and purple from late spring through summer. This compact biennial forms neat clumps with narrow green leaves and reaches 1-2 feet tall. It's perfect for borders, cottage gardens, and cut flower arrangements.
In an HOA neighborhood
Sweetwilliam is an HOA-friendly choice. Maintenance level: low. Tidiness: 4 out of 5.
Works well in: front yard, foundation, street edge, mid zone.
Wildlife value
The fragrant blooms attract bees, butterflies, and moths throughout the extended flowering period. The clustered flower heads provide an excellent nectar source for pollinators during peak summer months.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Pollinator Patch flags toxic plants like Sweetwilliam and shows pet-safe natives for your ecoregion instead.